package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取请求的路径
        String uri = request.getRequestURI();
        //2.判断是否为登录请求,如果是,放行
        if (uri.contains("login")){
            log.info("登录请求:{},放行", uri);
            filterChain.doFilter(request, response);
            return;
        }
        //3.获取请求头中的token
        String token = request.getHeader("token");
        //4.判断token是否为空,如果是,响应401状态码
        if(token == null || token.isEmpty()){
            log.info("请求头中缺少token");
            response.setStatus(401);
            return;
        }
        //5.解析令牌,如果令牌违法,响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(token);
            log.info("获取用户id,存入ThreadLocal");
            Integer userId = claims.get("id", Integer.class);
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }
        //6.放行
        log.info("放行");
        filterChain.doFilter(request, response);

        //从ThreadLocal中删除用户
        log.info("删除用户");
        CurrentUserHoler.removeCurrentUser();
    }
}
